php determines access IP

判断访问IP

php代码

function getIP() {
    if (! empty ( $_SERVER ["HTTP_CLIENT_IP"] )) {
        $cip = $_SERVER ["HTTP_CLIENT_IP"];
    } else if (! empty ( $_SERVER ["HTTP_X_FORWARDED_FOR"] )) {
        $cip = $_SERVER ["HTTP_X_FORWARDED_FOR"];
    } else if (! empty ( $_SERVER ["REMOTE_ADDR"] )) {
        $cip = $_SERVER ["REMOTE_ADDR"];
    } else {
        $cip = '';
    }
    preg_match ( "/[d.]{7,15}/", $cip, $cips );
    $cip = isset ( $cips [0] ) ? $cips [0] : 'unknown';
    unset ( $cips );
    return $cip;
}

?>

php